Self Learning Networks An Overview
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1 Self Learning Networks An Overview Alvaro Retana Distinguished Engineer, Cisco Services Slides by JP Vasseur and Jeff Apcar.
2 What Self Learning Networks is About SLN is fundamentally a hyper-distributed analytics platform... Putting together analytics and networking... Goldmine of untouched data on networking gear (sensing) Network learns and computes models on premise (analytics) The Network adapts, modifies its behavior (control) SLN for Security: attacks are incredibly sophisticated and targeted, ex- filtration of data being a major concern, requiring a nextgeneration approach => Stealthwatch Learning Networks
3 Harsh environments: instability of links, limited bandwidth, constrained nodes, stochastic networks (random probability distribution). Still need for some determinism, tight SLA and hyper-scale networks. And the network needs to be adaptive: every single network is different! From this SLN was incubated.
4 IoT/IoE Predictive models for large scale networks, enable: High performance High Resiliency Detection of disruptive subtle DDoS attacks IWAN Path Optimization Predict network behavior and traffic patterns based on multivariable and time- based modeling. Automatically select and optimize network path in realtime, adapt QoS, based on Business SLAs. SLN Internet Behavioral Analytics for Security Detect of multi-layer subtle DoS attacks and Anomaly Detection Auto learn new threats Massively Distributed, Global, real-time protection
5 SLN Architecture Principles For Security Fundamentally distributed, building models for visibility and detection at edge Mix of Machine Learning (ML) and Threat Intelligence Enrichment of context Ability to adapt to user feed-back (Reinforcement Learning) Advanced control handling networking complexity
6 Why Predictive Analytics? Multi-layered defense architectures no longer sufficient to prevent breaches caused by advanced malware... No longer a question of if or when but where... Many of the well-known assumptions are no longer true eg. Attacks come from the outside, deterministic, well understood Attacks are more and more subtle (Hard to detect...) Signature-based architectures vulnerable to mutating attacks (polymorphic) Dramatic increase of the number of 0-day attacks
7 What Is a Self Learning Network (SLN)? The network is truly adaptive thanks to advanced analytics A true paradigm shift! Move from Trial-and-Error model to a proactive approach using models built using advanced analytics The hard part is not just the analytics but the underlying architecture for self-learning and the how to
8 SLN Architecture
9 SLN Centralized Agent (SCA) Orchestration of DLAs. Advanced Visualization of anomalies Centralized policy for mitigation Interaction with other security components such as ISE and Threat Intelligence Feeds North bound API to SIEM/Database (e.g. Splunk) Evaluation of anomaly relevancy Distributed Learning Agent (DLA) Sensing (knowledge): granular data on control and data plane & local states Machine Learning: real-time embedded behavioral modeling and anomaly detection Control: autonomous embedded control, advanced networking control (police, shaper, recoloring, redirect,...)
10 The DLA Can Have Many Data Sources DLA has been designed for low footprint both in terms of memory and CPU Feature computation, ID & classification are performed locally Lightweight techniques employed with no significant impact on the edge device
11 DLA Internals
12 SCA Context Enrichment Identity Services Engine Username, domain, location, time Trigger for traffic mitigation ISE Edge AMP Threat Grid Feed for SLN Edge Control Advanced Malware Protection Advanced Malware Protection Adaptive Firewall w/ AMP Fire Power SCA Talos Feed DNS/IP Blacklists Reprogramming the network fabric (install new rules ) + close loop feed-back. Component to SLN Enhanced context, ML+Threat Intelligence Edge Control DLA Edge Learning: models normal traffic, graph-based anomalies. Edge Control: shape, police, drop, redirect,... Reroute, VLAN,...
13 On-Premise Edge Control Honeypot (Forensic Analysis) Controller infrastructure SCA Control Policy Smart Traffic flagging According to {Severity, Confidence, Anomaly_Score} Traffic segregation & selection Network-centric control (shaping, policing, divert/redirect) DSCP ReWrite CBWFQ Public/Private Internet DSCP ReWrite CBWFQ DLA DLA DLA Shaping
14 Anomaly Detection
15 Botnets and Data Ex-Filtration Techniques Size can range from thousands to millions of compromised hosts Botnet can cause DDoS & other malicious traffic (spam,...) to originate from the inside of the corporate network C&C (C2) servers become increasingly evasive Fast Flux Service Networks (FFSN), single or double Flux DGA-based malware (Domain Generation Algorithms) DNS/NTP Tunneling Peer-to-Peer (P2P) protocols Anonymized services (Tor) Steganography, potentially combined with Cryptography Social media updates or messages Mixed protocols... Timing Channels
16 SLN Paradigm Shift (Current) Generation of Security Architectures and Product Specialized Security gear connected to the network (FW, IPS,...) Heavily signature-based... to detect known Malwares Dynamic update of signatures SLN is Machine Learning based and pervasive Use of adaptive Machine Learning (AI) technology to detect advanced, evasive Malware: build a model of normal pattern and detect outlier (deviations) High focus on 0-day attacks Use every node in the network as a security engine to detect attacks Complementary to all other technologies (FW, IPS,...)
17 SLN Anomaly Detection
18 Categories Of Anomalies
19 SLN Visibility
20 Graph-Based Visibility
21 Visualising Anomaly Detection Process
22 Visualising Likely/Unlikely Flows Visualising Likely/Unlikely Flows Sydney Chicago Belgium Grey Graph: Blue Graph: Green Graph: FTP/SCP VoIP Shell DLA Raleigh Data Centre New York Beijing Red Graph: Anomaly San Diego Dallas Data Centre Static Versus Dynamic cluster computation ML algorithms are used to computed intercluster relationship Colored graphs Simple property of likelihood
23 Visualising Seasonality
24 Visualising Behavioural Analytics
25 Host Anomalies Using Feature Vectors
26 SLN Targeted Outcomes For The User Who talks to whom? Normal Behaviors Active applications between clusters Applications displaying seasonal behaviours Additional application characterisation Contextual data; usernames, domains... Anomalous Behaviors Detection of new applications where never used Detection of abnormal behaviours (data exfiltration) Adaption: Is abnormal event of interest? Upon detecting anomalies; Explain why? What has changed? Ability to perform advanced control (Shape, route, redirect...) SLN adapting to user expectations!
27 Summary SLN is a disruptive approach for malware detection using behavioral analytics, relying on dynamic learning, fully auto-adaptive Network data is analyzed locally by SLN using advanced and lightweight analytics The router can perform local mitigation Lightweight and distributed architecture that is scalable Visualization is key with simple understandable UI
28
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